Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.31: Poster
Mittwoch, 28. März 2012, 18:15–21:45, Poster B
Binary donor acceptor films of TTT and TNAP on Au(111) investigated by LEED and STM — •Benjamin Fiedler1, Elena Rojo-Wiechel1, Julia Simon2, Johannes Beck2, and Moritz Sokolowski1 — 1Institut für Physikalische und Theoretische Chemie der Universität Bonn — 2Institut für Anorganische Chemie der Universität Bonn
We prepared pure and mixed monolayers of electron accepting and electron donating molecules, namely Tetrathiotetracene (TTT) and Tetracyanonaphthoquinodimethane (TNAP), on Au (111) under ultrahigh vacuum conditions. The films were studied by LEED and STM. Pure TTT shows a complex film growth with a disordered phase at low coverage and an ordered phase at high coverage. In addition, the deposition of TTT leads to a lifting of the Au (111) surface reconstruction. For TNAP the Au(111) surface reconstruction is preserved after deposition. The unit cells of the ordered monolayers of TTT and TNAP are orientated differently with respect to Au(111) surface, but exhibit similar size and shape. Both molecules arrange in brick wall type structures. Quite differently, in the mixed film the molecules are arranged in alternating parallel rows of one type of molecule. Interestingly, the two dimensional arrangement of TTT and TNAP is rather similar to that in alternating stacks of TTF/TCNQ bulk charge transfer crystals.
This work was supported by the DFG through SFB 813.